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Stabilized Biosolids for Quarry Reclamation
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Stabilized Biosolids for Quarry Reclamation

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Stabilized Biosolids for Quarry Reclamation – Demonstration Project – Graymont Perspective

Stabilized Biosolids for Quarry Reclamation – Demonstration Project – Graymont Perspective

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    Stabilized Biosolids for Quarry Reclamation Stabilized Biosolids for Quarry Reclamation Presentation Transcript

    • Stabilized Biosolids for Quarry Reclamation – Demonstration Project – Graymont Perspective
    • Graymont Marketing Group Outline Graymont Project Drivers Biosolids Research Project - Technical Review - Laboratory Study - Deadman’s Flats Field Trail - University of Alberta Greenhouse Study - Quarry Reclamation
    • Graymont Project Drivers
    • Graymont Marketing Group Graymont Project Drivers  Two rotary kilns at Graymont’s Exshaw plant produce approximately 7,000 tonnes of dry LKD per year.  Though some of this product is beneficially used, some still must be sent to a local landfill for disposal.  Dry LKD is a good product for this application and there would be steady demand.  Graymont quarry sites require soil for reclamation which is in limited supply.  The opportunity exists to create a sustainable solution not only for Graymont but also for the region in which our employees live.
    • Graymont Marketing Group What is Lime Kiln Dust? Limestone Quicklime (Calcium Oxide) Fly Ash
    • Biosolids Research Project
    • Graymont Marketing Group Biosolids Research Project Technical Review Laboratory Studies Deadman’s Flat Field Trial University of Alberta Growth Trials Quarry Reclamation Trials
    • Technical Review
    • Graymont Marketing Group Alkaline Stabilization Process  Established technology  Simple process with low capital costs  Small plant footprint  Easy to operate  Alkaline treatment dilutes and fixates metals  Multiple End Uses  Over 40 facilities in the US and Canada
    • Graymont Marketing Group Two Types of Biosolids Defined with Respect to Pathogen Reduction  Class A (No Detectable Pathogens) - Not subject to use restrictions and can be generally used like any fertilizer.  Class B (A Reduced Level of Pathogens) - Subject to additional requirements including limiting public access to the site of application, limiting livestock grazing, and controlling crop harvesting schedules.
    • Graymont Marketing Group Canadian Standards  No comparable Canadian Standard for the classification of biosolids treated with lime.  The Canadian Council of the Ministry of the Environment (CCME) does have processing criteria for compost. Two types of composts are defined by this standard (Class A and Class B). These composts must meet standards for metal concentrations and pathogen reduction.  Alberta Environment also has standards for the land application of sewage sludge to agricultural land.  Canadian Food Inspection Agency (CFIA) regulates liming materials under the Fertilizers Act and Regulations.
    • Graymont Marketing Group Research Focus  Focus on meeting Class A stabilized biosolids criteria  Based on USEPA Standards for the Use or Disposal of Sewage Sludge (Title 40, Part 503)  Pathogen Reduction Requirements (Section 503.32 4)(ii)) - The pH of the sewage sludge must be over 12 for 72 hours. - The temperature of the sewage sludge must be above 52 oC for 12 hours or longer during the period when the pH is above 12. - At the end of the 72 hour period, the sewage sludge should have a percent solids above 50%.  Vector Attraction Reduction (Section 503.33 (b)(6)) - The pH of sewage sludge must remain at 12 or higher for two hours and then at 11.5 or higher for an additional 22 hours.  Must be below the ceiling concentrations for metals in Section 503.13  The parameters required for Alberta land application, compost classification and liming materials were also measured.
    • Laboratory Studies
    • Graymont Marketing Group Laboratory Scale Testing  Performed by Norwest (Exova) 80:20 Mix Temperature Profile Laboratories in Edmonton. 80  Initial trial of 60% sludge to 70 40% LKD resulted in a mixture temperature of over 100 oC. 60  The second trail of a blend of Temperature (oC) 50 80% Sludge and 20% LKD 40 provided a more moderate 30 temperature increase and kept the pH over 12 for 72 hours. 20  Blend of 70% Sludge and 30% 10 LKD in a small open pile 0 maintained pH but not 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 temperature. Time (Hours)
    • Deadman’s Flats Field Trial
    • Graymont Marketing Group Deadman’s Flats Pilot Plant Trial  Cooperative effort with MD Bighorn. Banff and Canmore biosolids were studied.  Simple process  Volumetric feed (Approximately 40% by weight LKD)  Separate buckets used for loading mixer and moving the stabilized products to storage.
    • Graymont Marketing Group Deadman’s Flats Pilot Trial  Temperature, percent solids and pH goals met.  Test results at 72 hours showed that Fecal Coliform and Salmonella levels were below detection level for all samples tested.  Heavy metals levels for the stabilized biosolids met Class A compost requirements with the exception of selenium.
    • University of Alberta Greenhouse Study
    • Graymont Marketing Group University of Alberta Greenhouse Study  Dr Anne Naeth coordinated project  Stabilized biosolids from the Dead Man’s Flats trials used  Focus on the growth of three native species - Two grasses (Wheat grass and fescue) - Forb (American vetch)  Four concentrations of biosolids - 100%, 75%, 50%, 0%  90 day growth period completed in October 2009
    • Graymont Marketing Group Comparison of control versus 50/50 blend Wheatgrass (Agtra) Fescue (Fessax) American Vetch (Vicame)
    • Exshaw Quarry Reclamation Project
    • Graymont Marketing Group Study Design  Based on a meeting with Alberta Environment and Sustainable Resource Development (SRD), a follow-up study is being developed which will examine the use of stabilized biosolids as a soil amendment in the reclamation of the Graymont’s Gap Quarry  The study will be coordinated by Anne Naeth of the University of Alberta  The design of this study is currently under development and should be presented to Alberta Environment and SRD for their approval in May 22
    • Graymont Marketing Group Gap Quarry 23
    • Graymont Marketing Group Questions?